Train with Masters, battle friends: The free lightsaber Academy app interacts with the interactive battle lightsaber, allowing kids to complete fun training missions and duel against Star Wars characters or go head-to-head with friends in the battle mode (additional lightsaber required, sold separately) Smart-hilt technology for interactive app gameplay: the lightsaber's Bluetooth-enabled smart-hilt contains an accelerometer, gyroscope, and barometer that tracks the angle, speed, and accuracy of moves and sends the info to the app Kyber crystal master selection: a Star wars-inspired light-up kyber crystal button inside the hilt Chamber lets kids switch between Masters Become a master of lightsaber combat: with the free lightsaber Academy app and lightsaber kids can train like Jedi or Seth and level up to earn new ranks and unlock new lightsaber skills Lightsaber with sounds, lights, and phrases: with Entertainment-inspired light and sound FX and character phrases, fans can imagine action-packed battles from the Star Wars universe